What is SCSI?

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This acronym is pronounced "scuzzy" and stands for Small Computer Systems Interface. There are two types of interfaces for hard drives, CD-ROM drives, etc. One is SCSI, the other is IDE. IDE is much more common and less expensive. SCSI is more expensive and also more flexible and generally faster. With a single SCSI card you can have 15 or more devices whereas you are only allowed to have 4 devices with an IDE system. The fastest hard drives (and generally CD-ROM drives too) are SCSI-based.